Messages in this thread | | | Date | Tue, 28 Jun 2022 13:10:05 +0530 | Subject | Re: [PATCH 0/8] arm64/perf: Enable branch stack sampling | From | Anshuman Khandual <> |
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On 6/27/22 16:31, Will Deacon wrote: > On Mon, Jun 13, 2022 at 03:31:11PM +0530, Anshuman Khandual wrote: >> This series enables perf branch stack sampling support on arm64 platform >> via a new arch feature called Branch Record Buffer Extension (BRBE). All >> relevant register definitions could be accessed here. >> >> https://developer.arm.com/documentation/ddi0601/2021-12/AArch64-Registers >> >> This series applies on v5.19-rc2 after the BRBE related perf ABI changes series >> (V6) that was posted earlier. >> >> https://lore.kernel.org/linux-arm-kernel/20220610035101.424112-1-anshuman.khandual@arm.com/ >> >> Following issues remain inconclusive >> >> - Jame's concerns regarding permission inadequacy related to perfmon_capable() >> - Jame's concerns regarding using perf_event_paranoid along with perfmon_capable() > > afaict, the capability stuff remains unresolved with the SPE driver, so I'd > really like to see it fixed there first before we add more broken drivers. > > https://lore.kernel.org/r/20220118100702.GB16547@willie-the-truck
Hello Will,
I did go through the above mentioned thread, but could not understand (clear enough) - what needs to be done. Could you please help summerize the problem and possible solutions which I can start looking into. Thank you.
- Anshuman
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